Barbed wire



Nov. 8, 1960 E. AjDUPoNT 2,959,399

BARBED WIRE Filed Oct. 1, 1957 United States Patent BARBED WIRE Enrique A. Dupont, Buenos Aires, Argentina, assignor to Establecimientos Metalurgicos Santa Rosa Sociedad Anonima, Buenos Aires, Argentina Filed Oct. 1, 1957, Ser. No. 687,576

3 Claims. (Cl. 256-7) This invention relates to improvements in barbed wire for fences and more particularly to improvements in barbed wire of the kind Where a single wire is used instead of the usual two wire twisted cable.

One object of this invention is to provide a barbed wire comprising a single barb wire carrying wire that may be made from hard, medium hard or tempered steel having a high traction resistance.

Another object is to provide a barbed wire having substantially the same coeflicient of elongation as other smooth steel fence wires which may be jointly used to form a fence.

A further object is to provide a barbed wire that may be stretched in situ in an easier way than known barbed wire.

A further object of the invention is to provide a barbed wire that may be easily manufactured and which is capable of keeping the wire barbs in position in spite of the thrust cattle or the like may exert against the fence.

Three general types of barbed Wire have been known up to the present, not to mention the primitive types of wire no longer in use which consisted of a round or oval wire or flat wire having serrated edges. The first type is made of two longitudinal wires twisted together to form a cable and having wire barbs wound around either one or both of the cable wires at spaced intervals. A second type is made of a wire having a series of bends around which the wire barbs are wound. This kind of barbed wire cannot be used in all types of fences because it cannot be stretched. Longitudinal tension tends to straighten the wire and allows the wire barbs to slide along the wire. A third type of barbed wire consists of a wire having loops formed at spaced intervals. The wire barbs are knotted to the loops. The manufacture of such wire is rather diflicult and each knot represents a weakened point. The wire breaks easily at the knots when tensioned.

The barbed wire which the present application contemplates consists of a single main wire carrying the wire barbs, and is characterized by the fact that the wire barbs are wound around portions of the main wire having a cross-section difierent from the cross-section in other portions of the wire, the places where the section changes forming shoulders which prevent the wire barbs from moving.

In other words, the wire itself has parts having a width greater or smaller than the rest of the wire. The shoulders that are formed at the places where the cross-section of the wire changes its shape act as abutments for the spirals of the wire barbs.

The invention, and the manner of carrying it out in practice, are further explained, by way of example only, in connection with the accompanying drawings wherein;

Fig. 1 is a side view of an embodiment of the invention according to which a main wire has a generally oval or flat cross-section, the wire barbs being wound between short cylindrical portions on the main wire;

Fig. 2 shows an enlarged longitudinal section of the barbed wire of Fig. l, in the zone where a wire barb is wound between said cylindrical portions, the corresponding cross-section of the wire also being shown;

Fig. 3 is a lateral view of another embodiment of the invention, in which the wire barbs are wound around and covering a cylindrical portion of an oval wire.

Fig. 4 shows a longitudinal section of the barbed wire shown in Fig. 3 and its cross section.

As will be seen in the embodiment shown by way of example inFigs. 1 and 2, the improved barbed wire comprises a substantially oval steel wire having a number of pairs of cylindrical portions between which the wire barbs are wound.

In these figures, 1 indicates the oval portions of the wire carrying the wire barbs, and 2 its cylindrical portions. Each wire barb 3 is spirally wound around an oval portion 1 comprised between two cylindrical portions 2. Ends E of the barbs are coincident with portions 2 or overlap the same. The fact that the wire barb is wound around an oval portion of the main wire prevents the wire barb from rotating around the main wire. The ends of cylindrical portions 2 protrude from opposed sides of the oval portions 1 and from shoulders S that prevent the wire barbs from sliding along the main wire.

In the embodiment shown in Figs. 3 and 4, the wire barb 3, instead of being wound between two cylindrical portions, is wound so that its spirals cover a single cylindrical portion 2' and extend over both adjacent parts of the oval portions 1 of the main wire. The spirals wound around the oval portions prevent the barb from rotating, and the shoulders formed by the cylindrical portion within the winding prevent the wire barb from sliding along the main wire.

What I claim is:

1. Barbed wire comprising a base wire having an oval portion, a pair of spaced cylindrical portions at the ends of said oval portion, and barbs on said oval portion between the cylindrical portions, said barbs including turns closely engaging said oval portion to prevent rotation of the barbs, and said barbs further including outwardly extending pointed ends substantially coincident with the cylindrical portions.

. 2. Barbed wire as claimed in claim 1 wherein said cylindrical portions include shoulders axially abutting said barbs.

3. Barbed wire as claimed in claim 1 comprising a plurality of like pairs of spaced cylindrical portions on the base wire and including the first said pair, said pairs being spaced wider apart than the cylindrical portions in each pan.

References Cited in the file of this patent UNITED STATES PATENTS 466,775 Deines Ian. 12, 1892 904,496 Shellaberger Nov. 17, 1908 FOREIGN PATENTS 14,676 Great Britain July 31, 1893 15,832 Great Britain June 22, 1895 Patented Nov. 8, 1960 

